[CodeExtractor] Do not marked outlined calls which may resume EH as noreturn

Treat terminators which resume exception propagation as returning instructions
(at least, for the purposes of marking outlined functions `noreturn`). This is
to avoid inserting traps after calls to outlined functions which unwind.

rdar://46129950

llvm-svn: 348404

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index a22789153df..dbcee9e5755 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -1369,9 +1369,12 @@ Function *CodeExtractor::extractCodeRegion() {
       DVI->eraseFromParent();
   }
 
-  // Mark the new function `noreturn` if applicable.
+  // Mark the new function `noreturn` if applicable. Terminators which resume
+  // exception propagation are treated as returning instructions. This is to
+  // avoid inserting traps after calls to outlined functions which unwind.
   bool doesNotReturn = none_of(*newFunction, [](const BasicBlock &BB) {
-    return isa<ReturnInst>(BB.getTerminator());
+    const Instruction *Term = BB.getTerminator();
+    return isa<ReturnInst>(Term) || isa<ResumeInst>(Term);
   });
   if (doesNotReturn)
     newFunction->setDoesNotReturn();